Steam-generator.



J. H. ROSENTHAL &E. C. CARNT. STEAM GENERATOR.

APPLICATION FILED JULY 20,1911.

1,167,841 Patented Jan. 11, 1916.

2 SHEETS-SHEET l- .I. H. ROSENTHAL & E. C. CARNT.

STEAM GENERATOR. Arum/11101111120 JULY 20, 1911.

Patented Jan. 11, 1916.

2 SHEETS-SHEET 2.

SAMUEL WHITE & COMPANY, LIMITED, or EAST STEAM-GENERATOR.

Specification of Letters Patent. Patented Jan, 11, 1916,

Application filed July 20, 1911. Serial No. 639,477.

To all whom it may concern:

Be it known that We, JAMES HERMANN ROSENTHAL and EDWIN CHARLES CAnN'r,both subjects of the King of the Unlted Kingdom of Great Britain andIreland, and residing at London, England, and East Cowes, Isle of Wight,England, respectively, have invented a certain new and useful Improvement in Steam-Generators, of whlch the following is aspecification.

This invention relates to improvements in superheaters applicable towater-tube steam generators having a common overhead steam and waterdrum connected by banks of tubes to separate water drums arranged oneach side of the furnace'below and parallel to the overhead drum.

More particularly the invention contem plates an improved arrangement ofthe superheater in relation to the boiler tubes, and an improvedarrangement of the tubes of the superheater in relation to the manifoldsor boxes thereof, as hereinafter more fully described.

In the accompanying drawings Figure 1 is a longitudinal verticalsection, Fig. 2 is a part elevation part vertical cross section,

and Fig. 3 is a plan showing by way of example a steam generator of thetype referred to equipped with superheaters constructed and arranged inaccordance with the invention; Figs. at, 5 and (3 show details of thesuperheater.

It will be seen that each orifice in each row is spaced from oneof thetwo adjacent orifices in the same row a distance exceeding the diameterof a U-tube; that each U-tube is spaced from the water tubes forming theupper wall of the oval chamber a distance exceeding the diameter of aU-tube and that the U-tube at each end of the chamber is spaced from thenearest drum a distance exceeding twice the radius of curvature of suchU-tube, that is a distance exceeding the distance between the two limbsof the U-tube. It will also be seen that by properly selecting the zonein which the superheater is placed, that is to say, disposing thesurface of the fireside of the superheater relative to the surface ofthe uptake side of the superheater as shown,

it is possible to maintain a constant in the. space between -E and thedegree of superheat at whatever rate the boiler is being worked.

he superheater shown comprises juxtaposed manifolds or boxes A and B oneside of each of which is provided with orifices to receive the ends ofU-shaped tubes G expanded thereinto, and the opposite side of each ofwhich manifolds or boxes A and B is provided with handholes D adapted tobe closed by covers in a manner well understood. Some or all of theU-shaped tubes are arranged in pairs, the tubes of each pair beingdisposed in the same vertical plane and all the tubes being parallel tothe axes of the overhead drum E and bottom drums F; one U-tube of eachpair being fitted withthe legs of the other U- tube of that pair, sothat the orifice into which the four upper ends or the four lower endsof two adjacent pairs of tubes are expanded are accessible through onehandhole gn the opposite side of the corresponding In order toaccommodate the superheaters, each of the banks of boiler tubes G (or,if a single superheater be used, one of the banks) is subdivided intotwo sub-banks or semibanks, the tubes of the two sub-banks beingoppositely curved, that is, curved concavely relatively to each other,so as to afford between them a chamber H of substantially oval formationin cross section, the major axis of which lies in a plane considerablyinclined to the vertical.

As shown, the superheater boxes are inclined to correspond with theinclination of the major axis of the oval chamber, and as the tubesfitted within said chamber lie in approximately vertical planes, it willbe understood that an extensive staggering of the tube hole is providedand a considerable distance afforded between the holes for receiving thetwo ends of each U-tube, so as .to provide for a large radius ofcurvature at the bend of the U-tube. I

As shown, valved pipe connections I and J are interposed between theoverhead drum superheater on the one hand, and between the superheaterand the main steam supply pipe on the other hand.

. ing

drum, there being one of said ateach side. of the steam and watch drum,

. each direct path Having now described our invention what we claim anddesire to secure by Letters Patent of the United States is 1. A steamgenerator, comprising a combustion chamber, an ofltake for the gases, asteam and water drum, a mud drum below the steam and water drum and atone side thereof, a plurality of sets of inclined water tubeswithin thecombustion chamber and in thedirect path of the gases to the ofltakeflue and connecting the steam and water drum to the mud drum, headers atone end of the generator, U-shaped superheater tubes connected to saidheaders, both legs of said tubes extending in a longitudinal directionbetween the sets of Water tubes and at approximately right angles to thewater tubes, the arrangement being such that the gases in passing fromthe combustion chamber to the ofitake flue will pass transversely overone set of water tubes, the superheater tubes, and then the second setof water tubes with:

out changing the general course of gases; substantially as described.

2. A steam generator, comprising a combustion chamber, an odtake fluefor the gases, a steam and water drum, a plurality of mud drums belowthe steam and. water a' plurality of sets of water tubes connecting muddrum with the steam" and 'water drum within the combustion chamber andin the direct path of the gases to the ofltake flue, headers at one endof the generators,

and U-shaped superheater tubes connected to said headers the legs ofsaid tubes extendsets of water tubes and at approximately right anglesto the water tubes on the opposite sides of the respective spaces, thearrangement being such that the gases in passing from the combustionchamber to the 0% take flue will pass approximately over the water tubesand the superheater tubes without changing the general course of thegases; substantially as described.

3.) A steam generator, comprising a steam and water drum, a mud drumbelow the steam and water drum and at one side thereof, a plurality ofsets of inclined water tubes within the combustion chamber and in the ofthe gases of the ofitake flue connecting the steam and water drum to themud drum, headers at one end of the generator, and U-shaped superheatertubes connected to said headers, both legs of said tubes extending in alongitudinal direction between the sets of water tubes and atapproximately right angles to the Water tubes, the upper legs of theintermediate tubes being approximately central between both legs of anadjacent tube, while the lower legs of the intermediate tubes areapproximately centrally located between the legs of an adj amud drums ina longitudinal direction between the met/ear cent tube at'the otherside, the arrangement 4. A steam boiler, having a smgle combustionchamber extending from one side of the setting to the other, a centralsteam and water drum, two mud drums below the steam and water drum,there being one amid drum on "each side of the combustion chats her, twobanks inclined tubes one on each side of'the setting bent tosubstantially the same radius Within the combustion chamher and in thedirect pathof the gases to the ofltake and connecting the steam andwaterdrum with the mud drums, each bank being-divided into two groups soas to form betwefen themian oval chamber having an ,inclinedmajor axis,a superheater in each chamber between the groups comprising parallel andcontiguous header boxes in ap-' proately the same planeas the major axisof the chamber, and U these header boxes 1 u ng transversely acrossjlthe banks of water tubes within the oval chamber, one end of eachU-tube being connected to one end to 'the other header box;substantially as described.

,5. A steam boiler, having a single combustion chamber extending rom oneside of the setting to' the other, a central etc and water drum, two mud'drums below the "steam and water drum, there being one mud drum 3n eachside'ot the combustion chamber, two banks of inclined tubes 'one on each.side of the setting bent to substantially the same radius within thecombustion chamber and in the direct path of the gases to the odtakeflue and connecting the steam and water drum with the mud drums, eachbank being divided into two groups so as to form be tween them an ovalchamber having an nheader box and the other a. etubes connecting clinedwmajor axis, a superheater 1n each chamber between the groups comprisingparallel and contiguous header boxes in approximately the same plane asthe major axis of the chamber, and U-tubes connecting these header boxesextending transversely across the banks of water tubes within the ovalchamber,"one end of each U- tube' being connected to one header box andthe other end to the other header box, the upper header being dividedinto two parts, the steam entering one of the compartments of the upperbox and then passing through the U-tubes to the other header, and fromthe last mentioned header to the steam od take through the othercompartment of the first mentioned header; substantially as described.

6. A steam boiler, having a single combue ma same radius within thecombustion chamber and in the direct path of the gases to the ofitakeflue and connecting the steam and water drum with the mud drums, eachbank being divided into two groups so as to form between them an ovalchamber having an inclined major axis, a superheater in each chamberbetween the groups comprising parallel and contiguous header boxes inapproximately the same plane as the major axis of the chamber, andU-tubes connecting these header boxes extending transversely across thebanks of water tubes within the oval chamber, one end of. each U-tubebeing connected to one header box and the other end to the otherheader-box, the upper header being divided into two parts, the steamentering one of the compartments of the upper box and then passingthrough the U-tubes to the other header, and from the last mentionedheader to the steam ofl'take through the other compartment of the firstmentioned header, the arrangement being such that the entering steamflows in parallel through half of the U-tubes while the steam leavingthe superheater flows in parallel through the other half of the U-tubes;substantially as described.

In testimony whereof we have signed our names-to this specification inthe presence of two subscribing witnesses.

JAMES HERMANN ROSENTHAL.

' EDWIN CHARLES GARNT.

Witnesses: y

WALLACE ORANSTON FAIRWEATHER, J OHN MCCLEABY.

